\(R_{2}\left( \eta _{1},\eta _{2}\right) \)  is also a probability distribution
along an infinitely thin phase space strip denoted by the real parameters \(B,D\) , which is a generalized entangled Radon transform [1]}, [2]} of the
two-mode Wigner function (in the entangled form) [3]}, [4]},
